Need more video memory? It worked before....

Hi all!
So, I'm on a Dell Inspiron duo (1090) netbook and I just recently did a factory restart with a disk. I used to be able to play Zoo Tycoon 2 easily, it ran better than I thought it would.
Now, every time I try to start it, it tells me that it needs more video memory. It needs 32 MB, can there is 0 MB available.
I'm not sure how to increase it-and I know it's possible, considering I used to be able to run it-or exactly what it means.
If it's of any use, when I restarted it, it was missing a few drivers, but I think I got them all back, if I didn't, is there a way to check that they're all there and up to date without going through each individual one?
If anyone's got advice, I would be most thankful!
Squid

Hi go to device manager and anything with a yellow mark next to it will need drivers. did you do all the windows updates?

Thank you so much!
My computer just needed to do a mass update. Works brilliantly now!

Your welcome glad all good now